 Rebecca HallFlorence Cathcart | Florence Cathcart |
 Dominic WestRobert Mallory | Robert Mallory |
 Imelda StauntonMaud Hill | Maud Hill |
 Isaac Hempstead WrightTom | Tom |
 Lucy CohuConstance Strickland | Constance Strickland |
 Cal MacAninchFreddie Strickland | Freddie Strickland |
 John ShrapnelReverend Hugh Purslow | Reverend Hugh Purslow |
 Diana KentHarriet Cathcart | Harriet Cathcart |
 Richard DurdenAlexander Cathcart | Alexander Cathcart |
 Alfie FieldVictor Parry | Victor Parry |
 Tilly VosburghVera Flood | Vera Flood |
 Ian HanmoreAlbert Flood | Albert Flood |
 Andrew HavillGeorge Vandermeer | George Vandermeer |
 Anastasia HilleDorothy Vandermeer | Dorothy Vandermeer |
 Joseph MawleEdward Judd | Edward Judd |
 Shaun DooleyMalcolm McNair | Malcolm McNair |
 Steven CreeSergeant Evans | Sergeant Evans |
| FFelix SoperJulian Dowden | Julian Dowden |
 Sidney JohnstonJohn Franklin | John Franklin |
 Spike WhiteAlistair Howell | Alistair Howell |
| CCharlie CallaghanChris Hartley | Chris Hartley |
| JJames KirkhamWilliam Ramsbottom | William Ramsbottom |
| EEwan Andrew WalkerRichard McGorian | Richard McGorian |
 Adam Thomas WrightMax Tebbitts | Max Tebbitts |
| BBen Greaves-NealChild Impostor | Child Impostor |
 Daniel PirrieCaptain Mills | Captain Mills |
| NNicholas AmerEdgar Hirsthwit | Edgar Hirsthwit |
 Nick MurphyTeacher 1 | Teacher 1 |
| NNeil BroomeSchool Master (uncredited) | School Master (uncredited) |
